Polyester General Note: Please allow 24 - 72 hours for your Mattress to regain its full shape. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.The expansion time of the mattress will vary as per the surrounding LAYERED TO PERFECTION - A foolproof combination of individually wrapped iCoil innersprings and supportive foams topped with a dreamy, microfiber quilted cover add up to undisturbed, restorative sleep that’ll have you daydreaming about bedtime SUPPORTIVE FOAM & POCKET SPRINGS – Layers of soft comfort foam, durable high density foam and motion-isolating iCoil pocket springs with a quilted, microfiber top; ideal for back sleepers and average weight to plus-sized sleepers OEKO-TEX CERTIFIED – This mattress conforms to Europe’s highest standards and meets OEKO-TEX requirements to be free of harmful chemicals and substances EXPERTLY PACKAGED - Our technology allows this mattress to be efficiently compressed one box that’s easily shipped and maneuvered into the bedroom; simply unbox, unroll and this mattress does the rest, expanding to its original shape within 72 hours Worry-free 10 year limited warranty included; twin mattress supports a maximum weight of 250 lbs, while all other sizes can support up to 500 lbs